^"The Greats' last wins: a look at the first 20 No. 1s". Tennis.com. Retrieved 15 July 2023. Mats Wilander won the last of his 33 career ATP titles in Itaparica, Brazil in November 1990, cruising past Marcelo Filippini in the final, 6-1, 6-2. Wilander had risen to No. 1 on September 12, 1988, right after winning the last of his seven Grand Slam titles at the US Open, where he beat Lendl in the final.
^John Barrett, ed. (1991). The International Tennis Federation : World of Tennis 1991. London: Collins Willow. pp. 115, 137. ISBN9780002184038.